BPMN vs BPEL engine

hi
Just want to know about BPMN and BPEL execution,
what is the diff in execution? from performance perspective which is considered better?
i know BPMN and BPEL engines are there for execution for BPMN and BPEL and they both share same logging, auditing, instance hydration and dehydration and routing services.
But still is there anything that gets executed behind the scenes between BPMN and BPEL? and is any component has better perfomance in terms of execution,
Just in case assume same project is implemented in both BPMN and BPEL and executed, is there any performance factor associated?

The primary purpose of BPMN spec is meant to have a standard visual notation for business process diagram that can be understood by both business users and IT users. and in my view, the purpose of XPDL now is primarily used to be a standard serialization (interchange) format for exchanging BPMN models. BPMN does have all properties needed for generating executable BPEL. But BPMN is a visual graphic flow language and is more expressible than BPEL - not all BPMN flows can be expressed in BPEL and the mapping is non trivial. Having an XML execution language using BPMN seems too much and would cause serious problems in terms of portablity.
If you are interested in knowing more about BPMN-BPEL mapping, you can take a look at business process modeling info from http://www.eclarus.com. It contains good information on BPMN and BPMN-BPEL mapping.
Hong-Lee

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David Shaffer
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[email protected]
W: 650.506.1729
http://otn.oracle.com/bpel

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LOG
===
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<default.collaxa.cube.engine.dispatch> <BaseDispatchSet::receive> Receiving message 5934496-BpWai0-BpSwt0.4-1_expire for set engine
<default.collaxa.cube.engine.dispatch> <BaseDispatchSet::receive> Receiving message 5934493-BpWai0-BpSwt0.4-1_expire for set engine
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Thanks,
Praveen

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